TDDFT screening auxiliary withdrawing group and design the novel D-A-π-A organic dyes based on indoline dye for highly efficient dye-sensitized solar cells

Based on the experimentally synthesized dye JZ145, we designed a series of novel D-A-pi-A dyes SPL201-SPL211 with different pi-conjugated bridges and a new auxiliary withdrawing group for highly efficient dye-sensitized solar cells (DSSCs) using density functional theory (DFT) and time-dependent DFT(TDDFT). The molecular structures, energy levels, absorption spectra, light-harvesting efficiency (LHE), driving force of injection(Delta G(inj)) and regeneration(Delta G(reg)), electron dipole moment (mu(normal)) and lifetime of the first excited state(tau) were all scrutinized in details. Results reveal that the additional withdrawing group A2 and the pi-conjugated group di-eta-hexyl-substituted cyclopentadithiophene (CPDT) are more promising functional groups for the organic dyes with D-A-pi-A structure. We further designed SPL212 and SPL213 by employing indoline group as donor, the above screened functional groups as pi-conjugated bridge and additional withdrawing group, biscarbodithiolic acid and dicyanovinyl sulfonic acid groups as acceptor group. We found that SPL212 exhibits not only a higher molar extinction coefficient with an increment of 30.8%, larger excited state lifetime and an obvious redshift of 201 nm but also a broader absorption spectrum covering the entire visible range even up to near-IR of 1200 nm compared to JZ145. So, SPL212 can be used as a promising candidate for DSSCs. In addition, the results also prove that biscarbodithiolic add may be more favorable than dicyanovinylsulfonic acid as acceptor group in DSSCs. (C) 2016 Published by Elsevier B.V.